按照演练过程中扮演的角色和承担的任务不同，可将应急演练人员分为五类。其中，演练过程中

After its (1) to the (2) in 2001, China has taken steps towards opening up its (3) . As a condition for joining the WTO, China (4) itself to a (5) of trade liberalization, including the reduction of tariffs on cars and agricultural products. These tariffs reductions are both (6) and there is (7) for China to (8) at a faster pace.
A (9) of (10) and a more rapid and profound reduction of import tariffs would (11) of those Chinese consumers who would (12) imported products at lower prices. Second, a higher (13) into China would take away much upward pressure on the Renminbi and provide a true and lasting (14) to solving current global (15) . Indeed, even a modest (16) in the opening-up process would go a long way towards solving the problem.
The opening up of China’s markets to international competition should (17) deep reforms. Banks should be recapitalized, bad loans provisioned fully and state-owned companies’ runaway indebtedness (18) . Only when real progress in these areas is made should China begin to consider a reform to its (19) . Doing it any earlier would be highly (20) .

We must know what we should do and what we should avoid _______ a good impression on others in public places.

A．to leave

B．leaving

C．to have left

D．leave

裸眼视力判定标准是：辨别（）视力表的视标，要求每一个视标（）都能正确辨别，方算该行视力通过；辨别（）视力表视标时，每一行视标中允许有（）个看错，仍算该行通过；辨别0．7～1．0视力表视标时，每一行视标中允许有2个看错，仍算该行通过。

母线压花机油管与接头，完好无（）。

A.漏气

B.漏油

C.破损

D.缝隙

FAD中所含的维生素是

A．维生素B₁
B．维生素B₂
C．维生素B₁₂
D．维生素PP