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【简答题】
沥青按其在自然界中获得的方式可分为( )和( )两大类。
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【简答题】In writing telex messages，active voice instead of passive voice is often used．（ ）
【多选题】Which of the following about the passive voice is true?
A.
The passive voice is a grammatical construction.
B.
The subject of a sentence or clause featuring the passive voice typically denotes the recipient of the action (the patient) rather than the performer (the agent).
C.
The passive voice in English is formed periphrastically: the usual form uses the auxiliary verb be (or get) together with the past participle of the main verb.
D.
“Be given” is a passive voice structure.