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【单选题】

You are running a fever .You ____ to see the doctor .
You are running a fever . You ____ to see the doctor .

A.
need go
B.
must have gone
C.
should go
D.
can go
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参考答案:
参考解析:
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刷刷题刷刷变学霸
举一反三

【单选题】生态系统中能量流动与物质循环的关系是(  )

A.
虽然二者是各自独立的过程,但它们是同时进行的
B.
物质的合成和分解过程,伴随着能量的储存、转移和释放
C.
先有物质循环,然后才有能量流动
D.
由于有了能量的流动,所以才有了物质循环

【单选题】—Please tell me ________ for the meeting yesterday.—Sorry.The traffic was bad.

A.
why you came late
B.
why did you come late
C.
when you came late
D.
when did you come late

【单选题】下列哪种生态系统的自动调节能力最强[ ]

A.
嫩江
B.
蔬菜大棚
C.
西林郭勒草原
D.
西双版纳热带雨林

【单选题】I kept looking at the man, wondering _______.

A.
whether I have seen him before
B.
whether I had seen him before
C.
that I had seen him before
D.
when I saw him before

【单选题】.A look at recent trends in world fisheries reveals ________ the ocean on a global scale.

A.
how we have swiftly affected
B.
that how swiftly we have affected
C.
how swiftly we have affected
D.
however swiftly we have affected