Mountain climbing ________ be very tiring, and many people feel sick ________ the atmosphere gets thinner.
A．may; whileB．can; asC．must; thoughD．should; for
B

試題分析：考查情態(tài)動(dòng)詞和連詞，第一空填could，表示客觀可能，第二空填as，引導(dǎo)時(shí)間狀語(yǔ)從句，表示當(dāng)…時(shí)候，隨著，句意：爬山可能讓人疲勞，隨著空氣變得稀薄很多人會(huì)感到不適。選B。
點(diǎn)評(píng)：could可以表示“有能力”或者是“有客觀的可能”，還有同樣是當(dāng)…時(shí)候，while表示“一段時(shí)間”，as表示“隨著”。
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