It has been warned that        to the surroundings with people infected by Covid-19 without any

protection can lead to severe result.

being exposed

exposed

having exposed

to expose

考查非謂語動(dòng)詞。句意：有人警告稱，在沒有任何保護(hù)措施的情況下，暴露在有感染 Covid-19的人環(huán)境中會(huì)導(dǎo)致嚴(yán)重的結(jié)果。分析句子結(jié)構(gòu)可知expose在句中應(yīng)用非謂語動(dòng)詞形式，表示“暴露”短語為be exposed to,且從句中缺少主語，expose 與主語people是被動(dòng)關(guān)系，故應(yīng)用動(dòng)名詞的被動(dòng)式作主語。故選A項(xiàng)。

There                   in the world              China is a great country with a long history and rich culture.

are no doubt; that 

are not doubts; if

is no doubt; that

is not doubt; if

考查固定句型和同位語從句。句意：毫無疑問，中國是世界上有著悠久歷史，豐富文化的一個(gè)大國。分析句子可知，這個(gè)句型為 there is no doubt that 引導(dǎo)，表示“毫無疑問......”.本句為that that 引導(dǎo)的同位語從句，句意和句子結(jié)構(gòu)完整。故選C項(xiàng)。

The law           equal rights for men and women.

permits

confirms

persevers

guarantees

考查動(dòng)詞辨析。句意：這個(gè)法律確保了男女權(quán)利平等。A.permit允許；B.confirm證實(shí)，證明；C.persever堅(jiān)持；D.guarantee保證，擔(dān)保。分析句意可知，空格處為動(dòng)詞做謂語，其主語為the law,為單數(shù)則謂語動(dòng)詞用第三人稱單數(shù)形式。又因the law作用是保證公平。故選D項(xiàng)。

Jenny was very sad over the loss of  the photos she had shot in Canada,          this was a memory she especially treasured.

as

if

when

where

考查連詞辨析。句意：珍妮對失去她在加拿大拍攝的照片感到非常悲傷，因?yàn)檫@是她特別珍視的記憶。as 引導(dǎo)原因狀語從句，表示“由于”；if“如果”；when“當(dāng)......什么時(shí)候”；where“在哪里”。根據(jù)句意，前后文是因果關(guān)系，故選A項(xiàng)。

When it comes to modern communication, network safety is always a major          . 

concern

advantage

opportunity

solution

考查名詞辨析。句意：當(dāng)涉及現(xiàn)代通信，網(wǎng)絡(luò)安全一直是一個(gè)主要令人擔(dān)憂的問題。A. concern關(guān)心，令人擔(dān)憂的事實(shí)或情況；B. advantage 優(yōu)勢；C. opportunity 機(jī)會(huì)；D.solution解決方案。網(wǎng)絡(luò)安全一直是現(xiàn)代通信的個(gè)主要令人擔(dān)憂的問題。故選A項(xiàng)。