A top Obama administration official says the fight against terrorism has entered what he calls a new phase. Homeland Security Secretary Jeh Johnson spoke to ABC News on Sunday. He said groups like the self-declared Islamic State are successfully using social media to interest new members or to launch attacks in the United States.

His comments followed reports that federal law enforcement officials have launched hundreds of investigations to identify likely terrorists nationwide.

Mr. Johnson says the terrorist threat has changed because of the successful use of social media by the Islamic State. He says the group has shown the ability to reach out and recruit (招聘,吸收)members in the United States.

"Because of the use of the Internet, we could have little, or no, notice in advance of an independent actor (attacker) attempting to strike. And so that's why law enforcement at the local level needs to be ever more careful, and we're constantly reminding them to do that."

Mr. Johnson says federal, state and local law enforcement officials are cooperating more closely now than they were before the terrorist attacks of September 11, 2001.

Secretary Johnson says federal officials are fighting social media recruitment efforts by talking to members of the Muslim community in the United States. Mr. Johnson admits the Islamic State seems to be effective in its communications. He says Muslim communities must help federal, state and local officials fight the recruiting efforts.

Mr. Johnson supported the decision by U.S. military officials to increase security at bases across the country. The FBI had warned that Islamist militants could attack troops or local police.

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1. _________are (is) making use of the social media to attract people to join them. （细节理解）

A    Obama

B    Terrorists

C    Security Secretary

D    Johnson

2. Why do they warn the local law enforcement workers to be more careful? （细节理解）

A    Because they are constantly reminding the terrorists.

B    Because independent actors are using the Internet.

C    Because terrorists have little notice of their attempt to strike.

D    Because the Internet makes it harder to attack the terrorists.

3. The effective way to fight the using of social media to recruit is to________. （细节理解）

A    admit the Islamic State is effective

B    cooperate more closely with the terrorists

C    fight social media recruitment efforts

D    talk to members of the Muslim community

4. Who suggested increasing security at bases across the country? （细节理解）

A    The FBI

B    Mr. Johnson

C    U.S. Military officials

D    Islamist militants