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【单选题】

When Laura Langanki found extra towels in the laundry smelling lemony fresh, she never【C1】______ that meant her 13 year-old son was 【C2】______ drugs. 'We were 【C3】______ three to four bottles of air freshener a week,' says the 42-year-old nurse from Plymouth, Minn.' 【C4】______ a fool, I thought my kid was becoming more interested in personal 【C5】______ 'Instead, Jake was 'huffing'—spraying the 【C6】______ into towels and inhaling the fumes. 【C7】______ his mother found out two years later, he was smoking pot, using acid and crystal met amphetamine, drinking alcohol, and snorting cocaine. Laura had warned Jake not to 【C8】______ illegal drugs when he was younger and felt sure he got the message. But according to a new U. S. News 【C9】______ , even parents who believe they talk often with their kids about drugs can be 【C10】______ . Of 700 parents and 700 s surveyed, 1 【C11】______ 3 parents claimed to talk about drugs 'a lot' with his or her , while only 14 percent of agers felt they had frequent conversation on the 【C12】______ with Mom or Dad. That failure to communicate can have 【C13】______ consequences. In a 1999 survey of nearly 10, 000 parents and s 【C14】______ the Partnership for a Drug-Free America, s who 【C15】______ anti-drug messages at home were 42 percent 【C16】______ to use drugs. 'This may sound like 【C17】______ advice,' says Steve Dnistrian, executive vice president of the group. 'But hard numbers quantify that parental communication is the 【C18】______ most important thing we can do to pr children using drugs.' Indeed, parents received 【C19】______ vote of confidence from 63 percent of the s polled by U. S. News, 【C20】______ siblings, teachers, and friends. 【C1】

A.
believed
B.
dreamed
C.
assured
D.
thought
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【单选题】The consistent burning of fuel oil with a high sulfur content in a diesel engine will result in .

A.
clogged fuel injection pumps
B.
increased cylinder liner wear
C.
intake valve stem corrosion
D.
varnish deposit on pistons

【单选题】pH = 9.0 的含有 5.0×10 -2 mol / L NaCN 和 1.0×10 -2 mol / L Hg(NO 3 ) 2 的溶液中,叙述 CN - 的物料平衡方程式正确的是 [ HCN 的 p K a = 9.21 , 生成 Hg(CN) 4 2- 络合物 ]

A.
[ CN - ] + 4[ Hg(CN) 4 2- ] = 5.0×10 -2
B.
[ CN - ] + [ Hg(CN) 4 2- ] = 5.0×10 -2
C.
[ CN - ] + [ HCN ] + 4[ Hg(CN) 4 2- ] = 5.0 ×10 -2
D.
[ CN - ] + [ HCN ] + [ Hg(CN) 4 2- ] = 5.0 ×10 -2

【单选题】The burning of fuel oil in a diesel engine having a high sodium content, will cause _.

A.
corrosion and grooving of exhaust valves
B.
corrosion and gumming of the fuel injection pump
C.
salt deposits in the exhaust manifold
D.
slag deposits in the fuel injection equipment

【单选题】小儿乳牙总数的推算方法是

A.
月龄减5-8
B.
月龄减2-3
C.
月龄减4-6
D.
月龄减8-9
E.
月龄减1