摘要:85.去掉第二个and考查句子结构的分析.本句前面是if引导的条件句.后面是主句.所以去掉and. I [2010·成都三诊] Usually most divers don’t go very deep. Mainly they dive to 66. a depth of about 20 meter. Then they swam around as they slowly 67. return to the surface. Everyone wants to dive must first have diving 68. lessons. There are few dangers that you have to learn about. For one 69. thing, you might have problems with its air bottle. A diver must 70. know how the equipment works and is able to recognize possible 71. problem. There are also dangerous types of fish that you must look 72. out for. You must be familiar to the environment you’ll be diving 73. in. Before you go on a dive, make sure you know that what you are 74. getting into. Diving may look easily, but if you don’t have the 75. necessary training, it can be both difficult and dangerous.

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