按真核生物起源的内共生假说来看，由于远古的古生菌细胞先后吞噬了细菌中的______和______并发生了内共生作

In English learning, ______ is more practice.

A．what do you need to do B．what we need

C．that we need doing D．which we need to do

【名词解释】________ no need to hurry. We still get much time.

To solve our industrial problems, the author thinks we need

A．equality in salaries.

B．a reduction in the work time.

C．an improvement in moral standards.

D．a more equal distribution of responsibility.

() we need more practice is quite clear.

A.If

B.What

C.That

D./

__________ we need more practice is quite clear.

A.What

B.That

C.Which

D.When

Why should we learn from tests and quizzes？

A．To get the information we need to learn.

B．To get a higher score next time.

C．To get to know more about teachers.

D．To try to memorize every detail.

We need one hundred more signatures before we take the ______ to the governor.

A．plea

B．petition

C．patent

D．claim

We need one hundred more signatures before we take the ______ to the governor.

A．plea

B．petition

C．patent

D．claim

We need one hundred more signatures before we take the ______ to the governor.

A．plea

B．petition

C．patent

D．claim

听力原文：We need to start immediately, don't we？

(A) Yes, if we want to be on time.

(B) Twenty minutes, I suppose.

(C) Work starts at 9 o'clock, usually.

(31)

A．

B．

C．