1 . Like all our organs, the brain has evolved(进化), increasing in ______ and information storage, over millions of years.

A．cruelty

B．campaign

C．credit

D．complexity

2 . Chinese visitors were the highest-spending group visiting Switzerland, where they spent ______ average of 380 Swiss francs ($425) per person per day, according to Switzerland Tourism.

A．/

B．an

C．the

D．on

3 . The headteacher approached the monitor to ________what happened in the class during his absence.

A．catch up

B．catch on

C．catch up with

D．catch up on

4 . China’s industrial output grew by 2.4 percent in the January-February period, ________ lower than the 2.6 percent expected by a Reuters poll.

A．slightly

B．originally

C．regularly

D．incredibly

5 . The main reason ________ monarch butterflies are endangered is ________ lots of places ________ used to be home to them have been seriously destroyed.

A．why; because; where	B．that; because; where
C．why; that; that	D．why; that; where

6 . For ________ variety of reasons, we have to replace the old network system ________ a new one.

A．the; for

B．the; with

C．a; for

D．a; with

7 . Rugosa rose, a source of perfume, is a species of roses ________ to eastern Asia.

A．close

B．ancestor

C．home

D．native

8 . The underlined word can be replaced by ________.
The New York Times used the word “groundbreaking” to praise the new online teaching platform and wrote that “it represents a rarely seen era”.

A．primitive

B．abstract

C．innovative

D．accessible

9 . Impossible ________ it is for us to live in an environment free of pandemic, we had better try our best to avoid ________.

A．however; affected	B．though; to be affected
C．although; being affected	D．as; being affected

10 . Judging from her ________, she liked the birthday present.

A．reaction

B．personality

C．impact

D．authority