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举一反三
【单选题】设a，b为整数，给出下列四个结论：(1)若a+5b是偶数，则a-3b是偶数；(2)若a+5b是偶数，则a-3b是奇数；(3)若a+5b是奇数，则a-3b是偶数；(4)若a+5b是奇数，则a-3b是奇数，其中结论正确的个数是______
A.
0
B.
1
C.
2
D.
3
E.
4
【单选题】患者，女性，25岁，右下后牙剧痛3天。检查见患者面色苍白，精神疲惫，颌面大面积龋坏，探诊无痛感，叩痛明显，松动Ⅱ度，温度测试无反应。 进一步的检查应是
A.
牙周袋探诊
B.
实验性备洞
C.
选择性麻醉
D.
X线片检查
E.
牙髓电活力测验
【单选题】一艘海轮从上海出发驶向美国旧金山。当海轮途经图中P点时正值日出，图中EF线表示晨昏线。读图回答下列问题。 此时太阳直射点的位置最接近______
A.
15°N，135°E
B.
15°S，135°W
C.
23°26"N，0°
D.
23°26"S，180°
【单选题】Questions 7 to 10 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage. After going over some basic about hea...
A.
put the theory learned into practice
B.
finish and check their homework
C.
solve some academic problems
D.
cure people who are experiencing hearing loss