面包的香味来源于两个阶段：（）和（）形成的风味物质。
When does the unusually broad global travel alert come?
A. Just after the US Diplomatic Mission has been deadly attacked in Benghazi.
B. Just after the US government is preparing to close 20 embassies and consulates.
C. Just after the major targets of terrorist attack inside and outside America have been specified.
D. Just after Nasir al-Wahishi has become the new leader of terrorists after the death of Anwar Al-Awlaki.
Why does the US State Department issue a worldwide travel alert for Americans living or traveling abroad?
A. Because of the deadly strike on the US consulate in Benghazi.
Because of the death of the terrorist Anwar Al-Awlaki in a drone strike.
C. Because of intelligence about the potential attacks originating in Yemen.
D. Because of the 11-year anniversary of the 9/11 attacks.
How long does the worldwide travel warning issued by the US State Department to US citizens last?
A. Throughout the month of August.
B. Throughtout the second half of August.
C. Throughout the whole year.
D. Throughout the month of September.
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