4．A　根据 Tons of water pushes against a diver deep in the sea. 可知这里想说在深海中，大量的水挤在潜水员身上，他的身体承受巨大的压力，故选A。

　　5．D　根据 The diver is then suffering from the bends (潜水员病). The bends can cause a diver to double up in pain. 可知这里想说潜水员病甚至会致命，故选D。

　　Ⅲ.语法填空

　　(2017·新疆兵团第三师一中调研)

　　It's spring again, and it's the season of fireflies (萤火虫). Their warm and gentle lights gitter in the quiet __1__ (dark), especially in mountainous areas or near water. No matter __2__ you are, or how old you are, you are sure to fall under their spell.

　　For many older people, fireflies are a reminder of their childhood. That's because they were a lot __3__ common long ago, __4__ the industrial development destroy so much fireflies habit. Wetlands __5__ (appear) and chemicals were dumped into river. Fireflies were left with __6__ to feed or breed. What's more, fireflies seem to keep away __7__ artificial lights. As these spread, the bugs retreated. Not until they had almost vanished __8__ (do) people realize what was happening.

　　Over the past few years, though, conservation group and enthusiastic firefly lovers have come together to save these special creatures, __9__ are making a comeback. In natural setting all around __10__ island, fireflies are once again lighting up the night and helping create special memories for the next generation.

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